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Segment Information - Profit or loss information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net sales $ 3,651.2 $ 3,420.3 $ 10,795.7 $ 10,708.4
Cost of sales (exclusive of depreciation and amortization shown below) 2,619.6 2,414.0 7,642.9 7,487.9
Depreciation and amortization expense 70.5 67.9 208.9 198.1
Interest expense 14.4 10.9 40.2 30.3
Income tax provision 57.7 60.6 189.7 234.4
Net income 190.0 199.9 624.7 772.0
Other Segment Disclosures        
Purchases of property, plant and equipment     255.7 319.7
Metals Service Centers        
Other Segment Disclosures        
Purchases of property, plant and equipment 81.2 112.8 255.7 319.7
Metals Service Centers | Operating segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net sales 3,651.2 3,420.3 10,795.7 10,708.4
Cost of sales (exclusive of depreciation and amortization shown below) 2,619.6 2,414.0 7,642.9 7,487.9
Compensation expense 427.2 401.4 1,281.9 1,218.4
Other segment items 271.8 265.6 807.4 767.3
Depreciation and amortization expense 70.5 67.9 208.9 198.1
Interest expense 14.4 10.9 40.2 30.3
Income tax provision 57.7 60.6 189.7 234.4
Net income $ 190.0 $ 199.9 $ 624.7 $ 772.0